Griffith
p390 cross-references this Einion Sais to Griffith p126 which includes
another Einion
Sais of Bodorgan with a note that the latter "must not be confounded
with Einion Sais, of Castell Einion Sais, the ancestor of Sir Dafydd Gam,
as Einion Sais, of Bodorgan, lived much later." This appears to suggest
that the Einion Sais shown here was probably that Einion Sais of Castell
Einion Sais.